In the off-season a lot of people liek to train FT/stamina because you only get two games per week during those periods. (or you're in the playoffs and need to prioritize winning over allocating training minutes) I am sort of torn on it - my first two season I team trained in two game weeks but almost none of those players are currently on my roster and stamina/FT didn't increase their sale value so I sort of feel like I wasted those weeks... so there isn't a clear answer but if you're going to train ST/FT then this is probably the time to do it, and if you want to keep that PG for any length of time I would get his FT up at least one level.
I would also work on getting his OD to at least strong or proficient and then train handling to boost his DR and HD. I am a huge fan of OD and try to make sure it is at least one level above every other skill, but that's just me.
Anyway welcome to the game and the forum and definitely consider signing up for the offsite forum
http://bbcanada.forumotion.com/ where there is some more specific talk about the NT and NT players. There are a lot of the stats of NT and U21 players posted there and that can give you a sense of how elite players are built.
Hopefully you can pick up a good prospect or two in the draft and if you need any help there are lots of smart managers here and on the off-site forum so feel free to ask for help.